Checkpoint IGCSE Year 9 – Revision
Sheet
Photosynthesis & Plant Reproduction
Section A: Photosynthesis – Basic Understanding
1. Fill in the blanks:
Photosynthesis takes place in the ________ of plant cells.
The main pigment involved is _________
The word equation for photosynthesis is:
_____________________________________________________________
2. State two factors that affect the rate of photosynthesis.
3. Use the graph below to answer the questions:
a) What happens to the rate of photosynthesis as light intensity increases?
b) Why does the graph level off?
c) Suggest another factor (not light) that could limit the rate at high intensities.
Section B: Plant Reproduction – Basic and Application
4. Name the parts of the flower and state their functions.
Use the diagram below to help:
a) Which part attracts insects for pollination?
b) Which part contains ovules?
c) Which part produces pollen?
5. Compare insect-pollinated and wind-pollinated flowers. Fill in the table:
Feature
Insect-pollinated Flower
Wind-pollinated Flower
Petals
Pollen grains
Stigma
Section C: Application Questions
6. A plant is kept in the dark for 48 hours. Then one of its leaves is tested for starch.
a) What result would you expect?
b) Explain your answer.
7. A student places a plant underwater and shines light from different distances. He counts
the oxygen bubbles per minute.
| Distance from light (cm) | Bubbles per minute |
|--------------------------|--------------------|
| 10
| 28
|
| 20
| 21
|
| 30
| 14
|
| 40
|7
|
a) Plot the data on a graph.
b) Describe the pattern shown.
c) What does this tell you about light and photosynthesis?